When you leave Mun, you will always be in an inclined Kerbin orbit UNLESS you were landed on Mun's equator AND took off heading due E or W. If you don't have the fuel for that, take what you get with a direct re-entry from Mun or aerobrake 1 or more times. Then wait for KSC to rotate close to your orbit and de-orbit so you land near it. If you have the fuel for it, put your Kerbin Pe at about 100km and then circularize. Even if you're trying to land as close to KSC as possible, you can do that after a few inclined orbits as Kerbin rotates under you. What matters is getting your Pe close to Kerbin. What am I doing wrong ?Īs Fecyk says, inclination doesn't matter. I tried taking off in many different directions but I always get orbits that are way out of line with Kerbin. As you can see my orbit is significantly inclined. I thought getting back to Kerbin would be the easy part. I managed to build a rocket that got me a Mun landing. On the other hand, if you're only slightly inclined, then you can burn for return as you would from an equatorial orbit without caring for the misalignment, but your slight misalignment will add up to a slight deviation from retrograde when you enter Kerbin's sphere of influence. If you can't wait for that, then you can burn to zero inclination and then leave at your pleasure, but it costs fuel.
When you are in an inclined orbit, the situation gets trickier, because the 'right time' doesn't occur every orbit of your spacecraft, but rather occurs only twice per Mun orbit of Kerbin at the points where your axis of ascending/descending nodes lines up with the Mun's prograde/retrograde. The conventional wisdom that tells you to use equatorial orbits for Mun landings and such exists because it simplifies returns: if you're in an equatorial Mun orbit, then burning prograde at the 'right time' ends up moving you retrograde with respect to Kerbin, and so you can return with only one burn. It's not a major problem you have enough delta-V to correct easily your periapsis. Without seeing the burn itself, I'll say that you most likely burned at the wrong time, so part of your prograde with respect to the Mun became radial-out with respect to Kerbin. How did I get these numbers for apoapsis and periapsis ?
I simply was not following the 90 degree vector. I figured out the orbit inclination problem.
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